octane rating
02-18-2011, 10:25 PM
#1
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octane rating for other then performance reasons why should we run 93 octane.. I have been told that there were two reasons one being is because our cars run higher compression from the factory! So if I am running a lower compression does that mean I can use the cheaper stuff? I know the other reason is because of timing being advanced of coarse.
02-19-2011, 05:18 PM
#4
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for other then performance reasons why should we run 93 octane.. I have been told that there were two reasons one being is because our cars run higher compression from the factory! So if I am running a lower compression does that mean I can use the cheaper stuff? I know the other reason is because of timing being advanced of coarse.
Actually I believe it says it's preferred. Not required.
02-19-2011, 05:22 PM
#5
For a factory stock engine you can run whatever octane you want. The knock sensor will adjust timing as needed. It is best to run the highest octane your local gas station offers for best performance results because of the higher compression and timing.
Actually I believe it says it's preferred. Not required.
Actually I believe it says it's preferred. Not required.
02-19-2011, 05:39 PM
#7
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02-19-2011, 05:53 PM
#9
I was saying it's ok to run lower octane on a stock car because of the timing tables in the stock PCM. And that there are also some "low octane" tables in built into the PCM, but I can't seem to find anybody that knows how/when they are accessed.
02-19-2011, 11:27 PM
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ok so no one really answered my question. Is it safe to run lower octane gas in a motor with low compression. When I was running my stock motor with a hypertech tune I wasn't able to because of knock. Now I am running a lower compression motor and someone told me it is safe to run lower octane gas. I am running a lt4 knock sensor so I would think that would make matters worse not better in this circumstance. Does compression play any part in this scenario?
02-19-2011, 11:52 PM
#11
ok so no one really answered my question. Is it safe to run lower octane gas in a motor with low compression. When I was running my stock motor with a hypertech tune I wasn't able to because of knock. Now I am running a lower compression motor and someone told me it is safe to run lower octane gas. I am running a lt4 knock sensor so I would think that would make matters worse not better in this circumstance. Does compression play any part in this scenario?
If you were stock with less compression absolutely. But we have zero information on your tune, let alone on your motor.
There is, however, usually quite a bit of timing advance on our tunes, so if this is the case, then it's is entirely POSSIBLE that you could very safely run 87 octane. But again we know nothing of any part of your car minus the fact that it's a 383 that used to have a hypertech... so therefore YOU MUST SCAN YOUR CAR TO FIND OUT ON YOUR OWN.
02-19-2011, 11:53 PM
#12
Also, scanning software is free for your car. You can either find somebody locally to borrow their cable, or buy your own for $65 shipped and scan it. Show us your datalog and we'll answer your question.
02-20-2011, 08:53 AM
#13
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87 and 89 burn faster then higher octane fuel, witch is why then cause valve ping and other simular issues on high compression engines. You can run any fuel you want to run but its not going to burn correctly and is going to cost you power and cause premature wear. Im sure this in more of a ? for your tuner than the form,like LSWHO we have no idea what your PCM is seeing or comanding. its a blind guess at this point. For what reason do you run lower compression on yur lt1 for?
02-20-2011, 09:48 AM
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in the future I plan on going boosted but for now I have to wait. As far as the cable I just got it in the mail and I am still trying to get connected for some reason I am not able to connect with tunerpro rt.
02-20-2011, 11:31 AM
#16
The b-bodies run on 87 octane with iron heads and just .4 point less compression. Aluminum heads should be more detonation resistant.
So it is very possible to make an LT1 happy on 87 octane, but as said nobody can tell you about your setup especially when you haven't really told us much about it.
So it is very possible to make an LT1 happy on 87 octane, but as said nobody can tell you about your setup especially when you haven't really told us much about it.
02-20-2011, 12:17 PM
#17
Did you select the correct com port for the cable?
I couldn't get tunerpro to connect without constant glitches.
I downloaded tts datamaster and it worked perfectly.
02-20-2011, 10:22 PM
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yes I selected the right com and installed the drivers for the cable. I emailed the guy at tunerpro and he gave me a couple of suggestions. I just need to get to it but, I just lost my starter in dd so I have to go change that out first.
